Cathode-ray tube



K. C. AUGENSTEIN ET AL CATHODE-RAY TUBE Filed July 15, 1943 July 15, 1947. I

2 Sheets-Sheet l y 1947- K. c. AUGEINSTEIN Er'AL C-AI'HODE-RAY TUBE Filed July 15, 1943 2 Sheets-Sheet 2 5 f r f 5 W 5 J m @T K m *1 Patented July 15, 1947 CATHODE-RAY TUBE Karl C. Augenstein and Albert Rieth, Cranston,

R. I., assignors to Speidel Corporation, Providence, R. I., a corporation of Rhode Island Application July 15, 1943, Serial No. 494,764

3 Claims.

This invention relates to the 'manufacture of. cathode-ray tubes and the like electronic beam-translating devices.

Electronic tubes of this type usually comprise an electron-responsive surface or fluorescent screen, an electron gun spaced from the screen and including a cathode and associated grid capable of projecting a beam of electrons against the screen, one or more anodes and two pairs of deflecting plates interposed between the electron gun and screen and arranged so as to efiect a conjoint control over the electron beam .projected by the gun. In the manufacture of tubes of this type considerable difllcultyis encountered in properly aligning the anodes and deflecting plates with the necessary degree of accuracy which is of the order of 0.001". It has been the usual practice to mount the anodes and deflecting plates .on the porcelain supporting members by means of metal straps which are more or less flexible, one part of the straps being positioned about the porcelain and another part welded or otherwise secured to the body of the anode and deflecting plate. Due to the flexibility of these straps, the inaccuracies involved in assembling the parts and the distortions inherent in welding, it is difficult to align the anodes and deflecting plates with the required degree of accuracy. In such constructions inaccuracies encountered in the surfaces of the porcelains can not easily be compensated and hence slight surface irregularities of the porcelains tend to hold the anodes and deflecting plates out of alignment.

IThe principal objects of the present invention are to overcome the aforementioned difiiculties andto provide an improved mounting for the anodes I and deflecting plates and an efficient method of making the same. Further objects relate to various features of construction and will be apparent from a consideration of the following description and accompanying drawings, wherein: i

Fig. 1 isan elevation showing a cathode-ray tube embodying a mounting construction in accordance with the present invention;

, Fig. 2 is an enlarged longitudinal section through the mounting shown in Fig. 1;

:Fig. 3 is an enlarged top plan view of the m un i Fig. us an enlarged section through a sleeve;

Fig. 5 is a fragmentary section showing the manner in which the sleeve and flange elements are. assembled; I

Fig. 6 is anenlarged section through a clamping element or tapered eyelet;

Fig. 7 is an enlarged section showing the manner in which the supporting flange is secured to the porcelain; I

Fig. 8 is a perspective of one of the deflecting plates;

Fig. 9 is a perspective of a supporting bracket or flange for a deflecting plate;

Fig. 10 is an enlarged longitudinal sectional view through a modified form of sleeve;

Fig. 11 is an enlarged longitudinal section showing the sleeve assembled with a flanged member; I

Fig. 12 is a view similar to Fig. 11 but showing the lower end of the sleeve rolled against the flanged member;

Fig. 13'is a view similar to Fig. 11, but illustrating the manner in which the beaded edge is radially contracted about the porcelain sup-' port; and

Figs. 14 to 17 are views, corresponding to Figs. 10 to 13, but illustrating a further modification.

In accordance with the present invention the anode or anodes and the deflecting plates are rigidly secured to suitable supporting members which are preformed so as to provide rigid laterally projecting flanges, each having a plurality of accurately located sleeves defining spaced. openings or recesses through which the insulating supports or porcelains project. The supporting members, being preformed and accurately fabricated preferably from suitable sheet metal, are assembled with the anodes and deflecting plates so as accurately to'maintain the desired dimensional relationships between the axes of the anodes and those of the sleeves, and between the surfaces of the deflecting plates and the axes of the'sleeves.

With the parts properly positioned and the assemblage firmly held in any suitable manner, the sleeves are firmly radially contracted about the support so as permanently to secure the parts in predetermined fixed position. To this end clamping elements or tapered eyelets may first be loosely applied about the sleeves and with the parts properly positioned and the assemblage firmly and accurately held in any suitable manner, the eyelets are then forced into telescopic relationship about the sleeves, thereby radially contracting the sleeves about the porcelains; or instead of using separate eyelets, one or both ends of the sleeves may be rolled outwardly to provide compressible annular beads which may, bythe' use of appropriate tools, be radially contracted aboutthe porcelains, thus providing the functional equivalent of the clamping eyelets in held in proper alignment and hence the anodes and deflecting plates are likewise accurately positioned with respect to one another. Due to the rigidity of the flanges 2| and 33 the alignment may be maintained during the final operation in which the sleeves are contracted about the porcelains, it being noted that inaccuracies of the surface of the porcelains may be compensated by the slight degree of yieldability of the sleeves and porcelains. Consequently in the completed structure the active surfaces of the anodes and the deflecting plates are properly positioned and the apertures in the anode are accurately aligned.

The completed mount may be assembled with the other elements of the cathode-ray tube in accordance with conventional practices and the usual electrical connections (not shown) may be made and the tube completed in the customary manner.

While I have shown and described one desirable embodiment of the invention, it is to be understood that this disclosure is for the purpose of illustration and that various changes in shape, proportion and arrangement of parts, as well as the substitution of equivalent elements, for those herein shown and described, may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

We claim:

1. In an electronic beam translating device of the type having an electron-responsive surface, an electron gun spaced from said surface and including an emissive cathode capable of projecting a beam of electrons toward said surface, one or more anodes, and deflecting plates interposed between said surface and electron gun, means for rigidly mounting said anode and deflecting plates in predetermined alignment, said means comprising at least one annular member fitting about each anode, each annular member being formed with a laterally projecting flange having circumferentially spaced openings adjacent to its periphery, a laterally projecting flange secured to each deflector plate and formed with spaced openings aligned with those in the flanges of the annular members, accurately aligned sleeves fitting within said openings and rigidly secured to their respective flanges, rod-like insulating members projecting through said sleeves so as to support each anode and the deflecting plates in a predetermined spaced aligned position, and tapered eyelets fitting about and contracting said sleeves fleeting plates interposed between said surface and electron gun, the method of mounting the anode and deflecting plates in a predetermined aligned position, which method comprises securing to the anode and deflecting plates preformed flanged members having sleeve positioned so as to define accurately aligned spaced openings extending about the anode and deflecting plates, applying tapered eyelets about said sleeves, inserting through the openings in said sleeves supporting members of insulating material, and forcing said eyelets into telescopic relation about said sleeves so as to contract the sleeves about the supporting members, thereby rigidly securing the parts in predetermined aligned position.

3. In the manufacture of an electronic beam translating device of the type having an electronresponsive surface, an electron gun spaced from said surface and including an emissive cathode capable of projecting a beam of electrons toward said surface, one or more anodes, and deflecting plates interposed between said surface and electron gun, the method of mounting the anode and deflecting plates in a predetermined aligned position, which method comprises securing to each anode an annular member having a preformed laterally projecting flange provided with spaced sleeves defining openings extending about the anodes, securing to each deflecting plate a preformed laterally projecting flange provided with a plurality of spaced sleeves defining openings adapted to be aligned with those of the sleeves carried by the annular members, applying tapered eyelets about said sleeves, inserting rodlike supporting members of insulating material through the openings in said sleeves, and forcing said eyelets into telescopic relation to said sleeves so as to contract the sleeves about said supporting members, thereby rigidly securing the parts in predetermined aligned position.

KARL C. AUGENSTEIN. ALBER'I'RIETH.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PATENTS Number Name Date 1,536,855 Housekeeper May 5, 1925 2,175,707 Shardlow Oct. 10,1939 2,058,293 Broadway et a1. Oct. 20, 1936 2,163,233 Brown June 20, 1939 2,164,951 Schwartz July 4,1939 2,219,111 Nicoll Oct. 22, 1940 2,227,087 Hinsch Dec. 31, 1940 2,284,547 West May 26, 1942 FOREIGN PATENTS Number Country Date 173,363 Great Britain Jan. 5, 1922 

